New research suggests that two simple, quantifiable measures -- spontaneous fluctuations in pupil dilation or heart rate -- could enable earlier diagnosis of Rett syndrome and possibly other disorders ...

The iris is a structure behind the transparent cornea of the eye. It has a circular opening called the pupil that changes size in response to the light level. Your pupils are usually the same size as ...

Picture this. You're sitting in an office reception, waiting to be called in for an interview for your dream job. You have no appetite. Your palms are sweaty and your heart is thumping. Your anxiety ...

Fatigue plays a crucial role in safeguarding against overexertion by inducing feelings of tiredness and causing temporary reductions in physical and mental performance. However, according to a recent ...